walking stick vs walkingstick

walking stick and walkingstick both are nouns.

Word	Noun	Adjective	Verb	Adverb
walking stick	Yes	No	No	No
walkingstick	Yes	No	No	No

As nouns, walking stick and walkingstick are synonyms defined as:

walking stick and walkingstick: any of various mostly tropical insects having long twiglike bodies

Other synonyms of walking stick include stick insect.

walking stick (noun)	walkingstick (noun)
any of various mostly tropical insects having long twiglike bodies	any of various mostly tropical insects having long twiglike bodies
a stick carried in the hand for support in walking